Free Wave Speed MCQs with Answers
34 Wave Speed MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Wave speed is the rate at which a disturbance or wave pattern travels through a medium, given by v = fλ, where f is frequency and λ is wavelength. Questions examine how speed changes between media, the relation among frequency, wavelength and period, and why wave speed is not the same as particle vibration speed.
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34 questions · page 2 of 2
- A. 300 m/s
- B. 150 m/s
- C. 300 cm/s
- D. 150 cm/s
Explanation: B is correct.Phase difference = 2pi/λ x Path differenceΔϕ = 2π/λ x Δxπ/3 = 2πf/v x 0.05 (v=fλ)π/3 = 2π(500)/ v x 0.05v= 150m/s
Correct answer: 150 m/s- A. 1 m/s
- B. 10 cm/s
- C. 2 m/s
- D. 40 cm/s
Explanation: The speed of a wave is given by the product of its frequency and wavelength.
Correct answer: 1 m/s- A. 40 Hz
- B. 1/5 Hz
- C. 5 Hz
- D. 500 Hz
Explanation: Option C is correct since the wavelength of the wave is 10 cm and speed is 50 cm/s. Since V=Frequency x wavelength , F= 50/10 = 5hz
Correct answer: 5 Hz- A. 40 Hz
- B. 1/5 Hz
- C. 5 Hz
- D. 500 Hz
Explanation: The equation is given by:v = f \λOn rearranging the equation for frequency, we get,f = v/λPutting values:f = (50 cm/s)/10 cmf = 5 Hz
Correct answer: 5 Hz- A. Wavelength decreases, speed does not change
- B. Wavelength increases, speed does not change
- C. Wavelength increases, speed increases
- D. Wavelength increases, speed decreases
Explanation: If a source producing waves moves away from the observer at a constant speed, then the observed wavelength will be larger than the…
Correct answer: Wavelength increases, speed does not change- A. 20/3 m
- B. 20x3 m
- C. 3/20 m
- D. 2/3 m
Explanation: Wavelength formula: v/f λ = 300/2000 λ = 3/20 m Hence, option C is correct.
Correct answer: 3/20 m- A. fλ
- B. λ/T
- C. Both A and B
- D. λT
Explanation: Explanation:The speed of a wave can be calculated using the formula: v = fλwhere v is the wave speed, f is the frequency of the wave, and…
Correct answer: Both A and B- A. 650Hz
- B. 20Hz
- C. 26Hz
- D. 3.8x10² Hz
Explanation: We know, The product of wavelength and frequency is speed c of waveMathematically:fx𝞴=cf=c/𝞴f=130/5f=26Hz.
Correct answer: 26Hz- A. Remains constant
- B. Becomes Half
- C. Becomes double
- D. Becomes four times
Explanation: As v=sqrt(T/d),Where T is tension and d is linear density of the stringAlso,d=m/l(mass per unit length)And mass is directly proportional…
Correct answer: Becomes Half- A. Remains constant
- B. Becomes half
- C. Becomes double
- D. Becomes four times
Explanation: The speed of transverse waves on a string is given by the formula v = √(T/μ), where T is the tension and μ is the linear density (mass per…
Correct answer: Becomes half- A. λ = v/f
- B. λ = vf
- C. λ = f/v
- D. None of above
Explanation: speed = frequency x wavelength Rearrange the formula and you get: wavelength = speed / frequency
Correct answer: λ = v/f- A. Elasticity
- B. Density
- C. Homogeneity
- D. All of the above
Explanation: The correct answer is D, "All of the above" because the wave velocity in any medium depends on all of these factors: elasticity, density…
Correct answer: All of the above- A. 50 nm
- B. 500 nm
- C. 5000 nm
- D. 100 nm
Explanation: Using the formula v = fλ, where speed of light in vacuum (v) = 3 x 108 m/sF = 6 × 14 Hzλ = v/f = 3 x 108 / 6 × 1014 λ = 500 nm
Correct answer: 500 nm- A. 16
- B. 8
- C. Speed remains same
- D. None is true
Explanation: If the absolute temperature of deuterium is increased by a factor of 16, the speed of sound waves in deuterium will also increase by the…
Correct answer: 16